NSES Content Standard B
Physical Science: Transfer of energy
Grades 5-8, page 155
Heat moves in predictable ways, flowing from warmer objects to cooler
ones, until both reach the same temperature.
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Benchmark 4E The Physical Setting: Energy
Transformations
Grades 3-5, page 84
When warmer things are put with cooler ones, the warm ones lose heat
and the cool ones gain it until they are all at the same temperature. A
warmer object can warm a cooler one by contact or at a distance.